Out of interest, what is your antivirus? I had a similar problem that I've just solved.
Try going into your antivirus and disabling the 'anti-banner' - then try http://warlight.net/SinglePlayer?ForceAd=AFG
if you still get the message, that wasn't the problem, but it might fix it - it did for me.
(I think mine worked as well when I disabled it, tried the link, then re-enabled it - but the ads continued to show (I think it basically reset or something).)
Just disabling the plugin on your browser wouldn't solve it though, it has to be done in the antivirus software itself.
That's what the issue was for me anyway (running Kaspersky anti virus), sorry if that doesn't help at all.
(Also, for some bizarre reason disabling the antivirus totally didn't work for me - I think it was still partially in the background or something, I only tried this by chance)
Edited 3/28/2014 23:25:10